Electronic – Import Parametric Sweep data from LTSPice into Matlab

dataltspiceMATLABsimulation

In LTSpice, I am running transient simulations with input 2 parameters (Amplitude and Frequency) being swept. The initial graph of all the data looks like this:

Obviously it is hard to tell what is going on. I would like to import the large simulation data into Matlab for analysis, where I can separate the data into individual waveforms – each corresponding to an amplitude and frequency that was swept.

I found a file online that implements the LTspice2Matlab command that imports a RAW file, however it cannot isolate each waveform as I expected. Are RAW files stored in a manner that each data point is paired with its amplitude and frequency? If so, how can I properly import this into Matlab?

Any ideas are welcome!

Best Answer

I believe you can convert the raw format to ASCII with ltsputil.exe. Look here for details.

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Electronic – Parsing Raw ADC Data into Voltage Levels

The problem has been solved.

function X = ReadTiAdcData(filename,N)
fid = fopen(filename,'r');
X = fread(fid,'int16');
fclose(fid);
X = X-2^(N-1);
X = X./2^(N-1);

Jim B's post explains the HSDC's binary file encoding and how to convert from it. N = 12. Turns out the full scale voltage didn't matter because we just needed the scaled voltage level relative to full scale, which was already encoded in the binary file, "full scale" being 4096.

I hope this is helpful for those who are struggling with converting raw ADC data using the TI HSDC.

Electrical – Import MCP602 Model into LTspice – Timestep Error

Your circuit would just work as a square wave output if you tried to prototype it, as you are connecting the inverting input to GND and driving the non-inverting input with a couple of volts. In this configuration, you are using the open-loop gain which is very large and it will always saturate the output of the opamp.

I'm not sure if there is a problem in the SPICE model, but I know that trying to go out of the voltage range of the part is causing the simulation to crash.

Try the following circuit and let me know if it runs. It's just a buffer configuration. I also added some offset to the V1 sine wave so that the output will never go negative.

Good luck!

Best Answer

Related Solutions

Electronic – Parsing Raw ADC Data into Voltage Levels

Electrical – Import MCP602 Model into LTspice – Timestep Error

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